It is completely free to use.

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Major features
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・ There is no membership registration

・ You can choose and study for each grade

・ There are multiple units for each grade, and you can ask your favorite questions.

・ You can check the learning record

・ You can study as many times as you like

・ There are more than 1000 questions in total, and questions will be given randomly.

・ There are explanations and detailed explanations for each unit.

・ There is a handwritten memo field, so you can handwrite the calculation process.

・ Children to adults can do it anytime, anywhere

・ Review with the app before the test

・ Ranking of scores and response times

・ Brain training
　　count up
　　Search for color mistakes
　　Search for the same number
　　Search for the same pattern
　　Instant memory
　　Hit&Blow
　　Flash mental arithmetic
　　Memorize numbers
　　Find Maximum / Minimum value
　　Find different character
　　Fill-in-the-blank calculation
　　Flash tap

・ Purchase the premium version
　　Advertisements can be hidden and can be used more comfortably

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Future release schedule
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・ Update of new problems (as needed)

We will update it every time to satisfy everyone.